Very. The sleve absorbs the torque. Without it the stud will take the torque and wont for long. The short of it, the stud will break. I had to pull on the torque mount with one hand and position the sleve with the other. Once in I used the handle of the rachet to get the sleeve to line up. Dont leave the sleeve out.
Yeah, I forgot about the plug. Thats got to get disconected.
When I did my Pulley swap, I changed the belt 3 times. Once to take the stocker off, and put the Gatorback on. Then to take the gatorback off and order one smaller and put the stock one back on. Then to take the stocker back off and put the new gatorback on. It got easier everytime.
PUT THE SLEEVE IN!